Force-Quit required after "License in Use Elsewhere" message

Question

It is known and expected that if I inadvertently leave VW open on computer "A," then go and work on Computer "B" (where the second version of my license is legally installed), when I return to Computer "A" I will have a message saying "Vectorworks willl now quit because this license is in use elsewhere... Please use care....(&c)..."

This message, yes, known and expected. However starting with SP3, it does not work to click the "OK" button to check that files have been saved properly. Hitting "OK" does not dismiss the error window which stays open persistently, a Force-Quit is required.

Seems to be new w/ SP3, which I am running on both machines. Yes I need to remember to be more careful but this seems like a bug. (Working on iMac at home, MacBook Air at work., Mac OS High Sierra on both machines.)